Mr. Robin McCormick:

Part of our journey to being able to cope with more and more wind in the system has been reverting to the conventional generators to ask them to change slightly the way they are run. We have gone through a process of getting them to change the setting. ROCOF is a rate of change of frequency, and the process will protect that generator from sitting in its own island where the frequency will change and damage the plant. We have worked with the generators to change their setting in order that if an event is on the system, we will not use all the generators when we do not need to. We want to keep them on the system even though there has been a change of policy.